Some other factors such as geographical location, status of animal ownership, sampling protocols, demographic factors, anthelmintic usage, and diagnostic techniques are responsible for the wide range of endoparasite prevalence found (16).

Despite its prevalence, little is known of the origins and global spread of this nematode because, in common with other endoparasites, specific historical records of its occurrence are few and, in any case, much later in date than its presumed origin.

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